Duplex flat joining and covering seam.



L. ONDERDONK.

DUPLEX FLAT JOINING AND COVERING SEAM.

APPLICATION FILED FEB. 27,1915.

Patented Feb. 6, 1917.

altar/mugs MLEMNQW ZITQ LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIGNOB. TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DUPLEX FLAT JOINING AND COVERING SEAM.

Specification of Letters Patent.

Patented Feb. 6, 1917.

Application filed February 27, 1915. Serial No. 11,025.

To all whom, it may concern:

Be it known that I, LANSING ONDERDoNK, a citizen of the United States, residing at New York city, in the county of New York, State of New York, have invented certain new and useful Improvements in Duplex Flat Joining and Covering Seams, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in seams for sewed articles and more particularly to a fiat seam for uniting two abutting edges of fabric.

An object of the invention is to provide a duplex fiat seam for uniting the abutting edges of fabric, which consists of stitches formed two rows at a time, one row being considerably within the edge of one piece of fabric and the other a short distance within the edge of the other piece of fabric, and similar stitches laid over the first stitches with one row considerably within the edge of the second piece of fabric, and the other row slightly within the edge of the first fabric, whereby the stitches of the first row adjacent the edge of the fabric are covered and bound down by the stitches of the second row, there thus being a double set of cross threads covering the fabric both above and below contiguous to their edge.

In the drawings,Figure 1 is a top plan View of a seam for uniting abutted edges, which seam embodies my invention; Fig. 2 is a bottom plan View thereof; and Fig. 3 is an enlarged inverted perspective view of the stitches.

The invention comprises generally a duplex seam for sewed articles consisting of trimmed and abutted edges of fabric, which are first united by stitches formed of anchoring loops laid parallel to each other on opposite sides of the abutted edges, these loops being formed one row considerably within the edge of one section of fabric, and the other row contiguous the edge of the other section of fabric and being joined onone face of the fabric by a cross-thread and on the other face by a looper thread which serves the triple purpose of locking the loops, joining the sections of fabric and partially covering the abutted edges. A second seam is superposed upon the first seam and formed in precisely the same way with one row considerably within the edge of one section of fabric and the other contiguous the edge of the other section, the thread between the loops of the row contiguous the edge binding down the adjacent portion of the cross thread of the other seam which extends across the meeting line of the fabrics and the cross threads of the superposed seam both above and below concatenating with their own needle loops in the manner set forth in connection with the first seam and sists of a fabric formed in two sections 1 and 2, the edges of which are trimmed and abutted, as at 3.

In forming the seam the edges are first joined by stitches formed by a sewingmechanism, which includes two spaced needles carrying the needle threads 4: and 5, respectively. The needle thread 4: is passed through the fabric 1 some distance from the edge, while the needle thread 5 is passed through the fabric 2 contiguous its edge. These needle threads form the needle loops 6 and 7 respectively. Passing through the needle loops beneath'the fabric is a looper thread 8. This looper thread concatenates in the usual way with the needle loops 6 and 7, and forms a connecting thread which joins and anchors the needle loops beneath the fabric passing back and forth across the abutted edges. A cross thread 9 on the upper surface is laid back and forth across the 1abutted edges and passes about each needle loop.

After having formed the stitches as above described, I next form an exactly similar set of stitches composed of connecting loops 12 and 13 of needle threads 10 and 11, the needle loops 12 being considerably within the edge of the fabric 2 and the loops 13 contiguous the edge of the fabric 1, so that the looper thread 14 and the upper cross thread 15 will overlie the cross threads in the first set of stitches. Furthermore, the consecutive needle loops of this set of stitches are disposed between consecutive needle loops of the other set of stitches, so that the threads between the stitches of this set in the fabric 1 will bind down the cross threads from the first set of stitches which extend from the fabric 1 across the meeting line to the fabric 2. That is to say, the needle thread of the second seam, which is contiguous the edge of the fabric 1, binds the cross thread 9 against the upper face of the fabric and on the underface the looper thread 14 binds the looper thread 8 against the surface of the fabric; also, as above stated, the upper and lower cross threads of the second set of stitches overlie those of the first set of stitches.

It will thus be seen that I have provided a duplex flat seain for uniting the abutted edges of fabrics, wherein two sets of parallel row stitches with upper and lower cross threads are utilized, the outer row of each set of stitches being well within the edge of each section of fabric and the inner rows lapping seam overlying the cross threads of the first seam, whereby the fabrics are anchored together and their raw edges covered.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A duplex seam for sewed articles comprising abutted edges of fabric, a seam including stitches having parallel rows of loops disposed on opposite sides of the abutted edges, one row of loops being considerably within the edge of one section of fabric and the other row being contiguous the edge of the second section of fabric, and cross threads respectively disposed on opposite sides of the fabric and connecting said loops, and a second seam having parallel rows of needle loops disposed on opposite sides of said abutted edges, and one row being considerably within the edge of the second section of fabric, and the other row being contiguous the edge of the first section of'fabric, and cross threads respectively disposed on opposite sides of the fabric and connecting said needle loops of the second seam, the cross threads of the second seam binding the cross threads of the first seam against the fabric.

2. A duplex seain for sewed articles comprising abutted edges of fabric, a seam including stitches having parallel rows of loops disposed on opposite sides of the abutted edges, one row of loops being considerably within the edge of one section of fabric and the other row being contiguous the edge of the second section offabric, and cross threads respectively disposed on opposite sides of the fabric and connecting said loops, and a second seam having parallel rows of needle loops disposed on opposite sides of said abutted edges, the pairs of needle loops in said seam being disposed between consecutive pairs of needle loops of the first seam, and one row being considerably within the edge of the second section of fabric, and the other row being contiguous the edge of the first section of fabric, and cross threads respectively disposed on opposite sides of the fabric and connecting said needle loops of the second seam, the cross threads of the second seam binding the cross threads of the first seain againstfthe fabric.

In testimony whereof, I aflix my signature, in the presence of two witnesses.

LANSING ONDERDONK.

lVitnesses W. BLANCHARD, W. E. BARNES.

Goples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C." r 

